postcode-nl/PostcodeNl_Api_MagentoPlugin — pull request #5 by sg3s (2013-10-24 14:32:48+00:00)
Title: This pull would add functionality to auto enable the manual input option

One of the possible error messages suggests to use manual input instead, but it is vague to the user exactly what he/she needs to do at that moment (clicking the checkbox). This automates that action, and keeps the error message.